Mike,
In my
research on quad-county points the shortest one I have found is an interstate
one. Brookings and Moody, SD
and
Lincoln and Pipestone, MN. Coming from the east, the county line road in
MN curves down slightly to meet its
mate
in SD. See attached 1:10000 map. But the boundary doesn't curve down. It
continues straight west and hits
SD in
Brookings County about 80 ft. north of
Moody County. So there is an 80 ft common boundary between
Brookings,
SD and
Pipestone, MN. The coordinates are 44deg 11' 49" N,
96deg 27' 10" W. On the map Brookings, SD and
Lincoln, MN are the more northerly
counties.
I
suspect that some of the intrastate quad-county points may have even closer
misses since sometimes one county
has the boundary on one side of the road rather
than in the center of the road, and the adjacent county line
doesn't
match
up. This is too fine a measurement to detect on
Topozone.
Thus
far I have identified 172 intrastate county quads, 19 interstate county
quads and 2 Canada-US county quads.
See
message 9389 for my report on the interstate ones. Someday I'll get the
intrastate ones posted.
Jack
Not too long
ago there was an extended discussion about the shortest
international
border. While doing some mapping in connection with my county
highpointing hobby, I ran across two short U.S. county common
borders. I offer these
to the group without any assurance that they
are the shortest, in fact
considering the 3,000+ U.S. counties, there are
most likely shorter common borders.
The obvious counterpart is the
longest common county border.
Macon and Monroe Counties in Missouri,
estimated at about 400 feet in length:
http://topozone.com/map.asp?z=15&n=4383981.59766708%20&e=560111.101455454&u=1&
datum=nad27
Summers,
West Virginia, and Giles, Virginia, estimated at about 520 feet:
http://topozone.com/map.asp?z=17&n=4142239&e=512472&s=50&size=m&u=1&layer=DRG2
5
Mike
Schwartz
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